If your headache is not taken care of by tylenol you should probably call your doctor, especially if you BP is even kind of high. It might not be related and it's also a possibility it's a bad migraine and they might be able to give you something for it that's safe during pregnancy.
i agree call the doc., don't risk pre-e slipping up. High B/p and head aches are bad enough. Chiropractor may not help much.
do you have a history of high b/p?